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What is in a Functional Block Diagram?

What is in a Functional Block Diagram?. A function block diagram describes a function between inputs and outputs and should describe the system in one picture. What should it include Show All major system components Interfaces to the outside world Interfaces between subsystems

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What is in a Functional Block Diagram?

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  1. What is in a Functional Block Diagram? • A function block diagram describes a function between inputs and outputs and should describe the system in one picture. • What should it include • Show All major system components • Interfaces to the outside world • Interfaces between subsystems • Clearly identify power, data, and structural interfaces • Should answer how the mission statement is met • Easy to read

  2. Pick and Choose • The following are FBD for progressively more complex systems. All contain strengths and weaknesses in conveying system level information. Pick ideas which would work well in describing your project. • The Final FBD is a poor example due to it’s complexity for this application. Use this as an example of what not to do as it is too hard to read.

  3. Power Activation Switch 12V Converter 3.3V Converter 5V Converter Stabilization and Attitude Sky Brightness Photometers Instrument Accelerometers Fixed Photometer 1 Each FOV ~10° Magnetometer Fixed Photometer 2 Command and Data Handling Gyroscopes Fixed Photometer 3 Data Storage Hard Disk Drive Filter Wheel Motor Filter Wheel Photometer EDAC 516 Connector HASP Power 27-32V at <2.5A Analog, Discreet Signals Micro Computer CCD Star Imaging System Instrument Small FOV CCD Imager FOV ~10° HASP Serial DB9 Connector Wide FOV CCD Imager Data Power Thermal Coatings, Insulation FOV ~150° Temp Sensors Heaters

  4. Functional Block Diagram Wiring Harness FOV360° FOV360° Acc Acc EPS EPS Photovoltaics 30W Photovoltaics 30W CDH CDH SFT SFT ACC ACC Acc Acc Acc Acc x4 x4 I2C I/O I2C I/O RAM TBD RAM TBD OS OS Battery A 14.4V 4AH Battery A 14.4V 4AH Battery B 14.4V 4AH Battery B 14.4V 4AH Inhibit Inhibit Scheduling Comm ADCS Science Scheduling Comm ADCS Science Control Control CPU AVR32 CPU AVR32 LV electrical interface LV electrical interface x4 x4 Acc Acc Acc Acc Inhibit Inhibit ABS ABS Serial I/O Serial I/O Regulation Regulation Control Control Acc Acc SSDTBD SSDTBD SEP SEP NMS NMS Instrument Instrument Mech1 Mech1 RTC RTC Instrument Instrument Lightband assy. Lightband assy. Control Control FOV32° x 1° FOV32° x 1° THM THM Coatings, Insulation Coatings, Insulation Mech2 Mech2 Control Control Sensors Sensors Control Control COM COM ADC ADC Torquerod A Torquerod A Tx Ant Tx Ant Tx 70cm 38.4kbps Tx 70cm 38.4kbps FOV90° FOV90° Control Control Torquerod A Torquerod A Instrument Instrument Mag (3-axis) Mag (3-axis) Satellite Sep Plane (SSP) Satellite Sep Plane (SSP) TNC TNC FOV 32° x 1° FOV 32° x 1° Rx 2m 9.6kbps Rx 2m 9.6kbps Rx Ant Rx Ant FOV90° FOV90° Horizon Crossing Sensor Horizon Crossing Sensor Horizon Crossing Sensor Horizon Crossing Sensor FOV 2° FOV 2° FOV 2° FOV 2° 5

  5. Bad Example

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